diff --git a/specifications/api/swagger.yaml b/specifications/api/swagger.yaml
index 77d7cbdf57f..bd3634535f0 100644
--- a/specifications/api/swagger.yaml
+++ b/specifications/api/swagger.yaml
@@ -406,6 +406,13 @@ x-drepKeyHash: &drepKeyHash
   description: DRep's key hash.
   pattern: "^(drep)1[0-9a-z]*$"
 
+x-drepScriptHash: &drepScriptHash
+  type: string
+  format: bech32
+  example: drep_script1wqaz0q0zhtxlgn0ewssevn2mrtm30fgh2g7hr7z9rj5856457mm
+  description: DRep's script hash.
+  pattern: "^(drep_script)1[0-9a-z]*$"
+
 x-walletAccountXPubkey: &walletAccountXPubkey
   description: An extended account public key (public key + chain code)
   type: string
@@ -2972,6 +2979,8 @@ components:
           title: casting a default vote
         - <<: *drepKeyHash
           title: vote to a drep represented by key hash
+        - <<: *drepScriptHash
+          title: vote to a drep represented by script hash
 
     ApiWalletDelegationNext: &ApiWalletDelegationNext
       type: object